Specifications - City of Montpelier, Vermont

Title:Montpelier District HeatingCity of Montpelier, VT15250 – Mechanical Insulation1. Fiberglass: 2" thick.Issue Date:September 28, 2012Page #:9 of 132. Calcium Silicate: 3" thick except 4½" thick for lowpressure boilers andsteamjacketed heat exchangers.E. Application Requirements: Insulate the following breechings and stacks:1. Breechings between heating equipment outlet and stack or chimneyconnection, except for double wall or factory insulated breechings.2. Stack from bottom to top except for factory insulated stacks.F. Insulate each breeching and stack specified above with one of the following typesand thicknesses of insulation:1. Fiberglass: 3½" thick.2. Calcium Silicate: 5" thick.3.5 INSULATION COVER/JACKETA. A vapor barrier jacket must be provided on all insulated piping, ductwork, orequipment whose operating temperature is less than 65 0 F or where otherwisespecified.1. Piping with elastomeric insulation does not require an additional vaporbarrier.B. A weatherproof cover must be provided for all insulated and uninsulatedductwork that is exposed to the weather.1. Exception: Ductwork that is stainless steel, aluminum, copper, or coatedwith a noncorrosive and UV resistant material, and does not otherwiserequire insulation.C. All piping w/ insulation that is exposed to the exterior must be protected with analuminum pipe insulation cover.MECHANICAL INSULATION 15250 9